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Grinding aid for improving early strength of Portland cement

A Portland cement and early strength technology, which is applied in the field of grinding aids for improving the early strength of Portland cement, can solve the problems of low addition amount and poor early strength effect, etc., and achieves enhanced early strength, reduced particle size, and increased ratio The effect of surface area

Inactive Publication Date: 2021-03-19
山东天汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing grinding aids have poor early strength effect during use, so in order to meet the early strength, it is necessary to provide a cement grinding aid that can improve the early strength of cement and has a low dosage

Method used

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  • Grinding aid for improving early strength of Portland cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A modified water reducer used in grinding aids for improving the early strength of Portland cement, the preparation method of which is as follows:

[0034] (1) Dissolve 8.89g of alanine in 100mL of water, adjust the temperature to 0°C, add NaOH dropwise to adjust the pH value to 8, and 2 Add 9.05g of acryloyl chloride under the same conditions, stir evenly, react for 6h, distill and filter to obtain compound A;

[0035] (2) Dissolve 50g of allyl polyoxyethylene ether in 50mL of water, heat to 40°C to dissolve, add 10g of hydrogen peroxide and 20g of compound A;

[0036] (3) Dissolve 11.6g of ammonium sulfite and 13.2g of trichlorethylene in 50mL of water, mix well, slowly add dropwise to the solution in step (2), and adjust the pH value to 8 with sodium hydroxide to obtain a modified water reducer.

Embodiment 2

[0038] A modified dispersant used in grinding aids for improving the early strength of Portland cement, the preparation method of which is as follows:

[0039] Dissolve 200g of sodium bisulfite in 500mL of water, stir to dissolve, raise the temperature to 60°C, slowly add 50g of acrylic acid, 20g of ammonium persulfate and 75g of acrylate to the solution dropwise, keep the temperature constant for 4 hours to obtain a modified dispersant.

Embodiment 3

[0042] A grinding aid for improving the early strength of Portland cement, which consists of the following raw materials in parts by weight:

[0043] 18 parts of triethanolamine, 10 parts of ethylene glycol, 1.3 parts of sodium gluconate, 0.5 parts of modified water reducer, 1 part of sodium hexametaphosphate, 2 parts of tartaric acid, 0.7 parts of modified dispersant, 0.3 parts of calcium sugar, 50 parts of water share.

[0044] The preparation method of the grinding aid for improving the early strength of Portland cement comprises the following steps:

[0045] (1) Add triethanolamine and tartaric acid into water, heat to 40-50°C, and stir to dissolve;

[0046] (2) Add ethylene glycol, sodium gluconate, modified water reducer, and sodium hexametaphosphate into the solution of step (1), and stir evenly;

[0047] (3) Add the modified dispersant and sugar calcium to the solution in step (2), and mix evenly to obtain a grinding aid.

[0048] The above-mentioned grinding aid wa...

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Abstract

The invention discloses a grinding aid for improving early strength of Portland cement. The grinding aid comprises the following raw materials in parts by weight: 10-30 parts of an alcohol amine compound, 5-20 parts of polyol, 0.1-3 part of sodium gluconate, 0.1-3 part of a modified water reducing agent, 0.5-2 part of sodium hexametaphosphate, 0.5-3 part of tartaric acid, 0.3-3 part of sugar calcium, 0.3-1.5 part of a modified dispersing agent and 20-100 parts of water. The grinding aid disclosed by the invention is added into Portland cement and has a good grinding aid effect on the cement, the granularity of a cement grinding material is obviously reduced, the specific surface area is increased, and the early strength of the Portland cement is further enhanced.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a grinding aid capable of improving the early strength of Portland cement. Background technique [0002] Cement is one of the most commonly used building materials and is widely used in civil engineering, hydraulic, national defense and other projects. During the processing of cement, it needs to be ground into powder with a mill. According to the existing cement grinding process, the mill Over-grinding often occurs in the silo, resulting in electrostatic adsorption and encapsulation. To solve this problem, grinding aids are usually added during the cement grinding process. [0003] Cement grinding aids are chemical additives that add a small amount of external substances (liquid or solid substances) during the grinding process of cement clinker, which can significantly improve the grinding efficiency and reduce energy consumption without damaging the performance of ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B103/52
CPCC04B40/0039C04B2103/52C04B24/122C04B24/02C04B24/10C04B22/16C04B24/06C04B24/123C04B24/005C04B22/062C04B24/32C04B22/068C04B22/147C04B24/04C04B22/14C04B24/045
Inventor 赵国庆王超王征夏凯
Owner 山东天汇科技有限公司
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